gaphas/tests/test_view.py

"""Test cases for the View class."""
import math

import pytest
from gi.repository import Gtk

from gaphas.canvas import Canvas
from gaphas.examples import Box
from gaphas.view import GtkView, View


class ViewFixture:
    def __init__(self):
        self.canvas = Canvas()
        self.view = GtkView(self.canvas)
        self.window = Gtk.Window.new(Gtk.WindowType.TOPLEVEL)
        self.window.add(self.view)
        self.window.show_all()

        self.box = Box()
        self.canvas.add(self.box)
        # No gtk main loop, so updates occur instantly
        assert not self.canvas.require_update()

        # Process pending (expose) events, which cause the canvas to be drawn.
        while Gtk.events_pending():
            Gtk.main_iteration()


@pytest.fixture()
def view_fixture():
    return ViewFixture()


def test_get_item_at_point(view_fixture):
    """Hover tool only reacts on motion-notify events."""
    view_fixture.box.width = 50
    view_fixture.box.height = 50
    assert len(view_fixture.view._qtree._ids) == 1
    assert view_fixture.view._qtree._bucket.bounds != (
        0,
        0,
        0,
        0,
    ), view_fixture.view._qtree._bucket.bounds

    assert view_fixture.view.get_item_at_point((10, 10)) is view_fixture.box
    assert view_fixture.view.get_item_at_point((60, 10)) is None

    view_fixture.window.destroy()


def test_get_handle_at_point(view_fixture):
    box = Box()
    box.min_width = 20
    box.min_height = 30
    box.matrix.translate(20, 20)
    box.matrix.rotate(math.pi / 1.5)
    view_fixture.canvas.add(box)

    i, h = view_fixture.view.get_handle_at_point((20, 20))
    assert i is box
    assert h is box.handles()[0]


def test_get_handle_at_point_at_pi_div_2(view_fixture):
    box = Box()
    box.min_width = 20
    box.min_height = 30
    box.matrix.translate(20, 20)
    box.matrix.rotate(math.pi / 2)
    view_fixture.canvas.add(box)

    i, h = view_fixture.view.get_handle_at_point((20, 20))
    assert i is box
    assert h is box.handles()[0]


def test_item_removal(view_fixture):
    assert len(view_fixture.canvas.get_all_items()) == len(view_fixture.view._qtree)

    view_fixture.view.focused_item = view_fixture.box
    view_fixture.canvas.remove(view_fixture.box)

    assert len(view_fixture.canvas.get_all_items()) == 0
    assert len(view_fixture.view._qtree) == 0

    view_fixture.window.destroy()


def test_view_registration(view_fixture):
    canvas = Canvas()

    # Simple views do not register on the canvas

    view = View(canvas)
    assert len(canvas._registered_views) == 0

    box = Box()
    canvas.add(box)

    # GTK view does register for updates though

    view = GtkView(canvas)
    assert len(canvas._registered_views) == 1

    window = Gtk.Window.new(Gtk.WindowType.TOPLEVEL)
    window.add(view)
    window.show_all()

    view.canvas = None
    assert len(canvas._registered_views) == 0

    view.canvas = canvas
    assert len(canvas._registered_views) == 1


def test_view_registration_2(view_fixture):
    """Test view registration and destroy when view is destroyed."""
    assert len(view_fixture.canvas._registered_views) == 1
    assert view_fixture.view in view_fixture.canvas._registered_views

    view_fixture.window.destroy()

    assert len(view_fixture.canvas._registered_views) == 0


@pytest.fixture()
def sc_view():
    sc = Gtk.ScrolledWindow()
    view = GtkView(Canvas())
    sc.add(view)
    return view, sc


def test_scroll_adjustments_signal(sc_view):
    assert sc_view[0].hadjustment
    assert sc_view[0].vadjustment
    assert sc_view[0].hadjustment.get_value() == 0.0
    assert sc_view[0].hadjustment.get_lower() == 0.0
    assert sc_view[0].hadjustment.get_upper() == 1.0
    assert sc_view[0].hadjustment.get_step_increment() == 0.0
    assert sc_view[0].hadjustment.get_page_increment() == 1.0
    assert sc_view[0].hadjustment.get_page_size() == 1.0
    assert sc_view[0].vadjustment.get_value() == 0.0
    assert sc_view[0].vadjustment.get_lower() == 0.0
    assert sc_view[0].vadjustment.get_upper() == 1.0
    assert sc_view[0].vadjustment.get_step_increment() == 0.0
    assert sc_view[0].vadjustment.get_page_increment() == 1.0
    assert sc_view[0].vadjustment.get_page_size() == 1.0


def test_scroll_adjustments(sc_view):
    assert sc_view[1].get_hadjustment() is sc_view[0].hadjustment
    assert sc_view[1].get_vadjustment() is sc_view[0].vadjustment